CN101333674B - Pretreatment process for electrophoresis coating - Google Patents
Pretreatment process for electrophoresis coating Download PDFInfo
- Publication number
- CN101333674B CN101333674B CN2008100165920A CN200810016592A CN101333674B CN 101333674 B CN101333674 B CN 101333674B CN 2008100165920 A CN2008100165920 A CN 2008100165920A CN 200810016592 A CN200810016592 A CN 200810016592A CN 101333674 B CN101333674 B CN 101333674B
- Authority
- CN
- China
- Prior art keywords
- workpiece
- treatment
- washed
- washing
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a treatment process before electrophoretic coating, which includes the following steps: a workpiece to be treated is put into a hyperbaric rinsing bowl for hyperbaric water washing firstly, then the water-washed workpiece is put into a degreasing tank for degreasing, the degreased workpiece is then put into the rinsing bowl again for water washing, then the water-washed workpiece is put into a pickling tank for acid washing treatment, the acid-washed workpiece is put into the rinsing bowl once again for water washing, then the water-washed workpiece is put into a lye tank for neutralizing treatment of surface acid of the workpiece, at last the neutralized workpiece is put into a 704A liquid for film treatment of the workpiece surface. Compared with the phosphating film layer, the treated workpiece film layer by adopting the treatment process has greatly improved binding force and appearance effect after being bended.
Description
Technical field
The present invention relates to a kind of metal surface treatment process, relate to the vehicle frame on a kind of automobile and the pretreatment process for electrophoresis coating of container specifically.
Background technology
Contain the more difficult neutralizing treatment of this material of inorganic phosphorus in the phosphating process that generally must adopt in vehicle frame of knowing at present, and the pre-treatment of container electrophoretic painting.Therefore be that discharging causes the rich phosphorus of aqueous systems one of to pollute, and phosphatization belong in strong acid equipment is had stronger corrosion harmfulness.Weld seam returns acid and gets rusty behind the bonderizing, is that the acidity by the built-in phosphatization liquid of weld seam causes.Phosphatization liquid is acid attack liquid.Phosphatization liquid before the electrophoresis is a middle strong acid etch process.Ensconce the corrodibility phosphatization liquid in the weld porosity, only depend on washing it can't be washed out fully, therefore can be remained in a standstill in weld porosity in a large number.At low temperature and in a short time, reaction is suppressed relatively.In case workpiece local upset takes place or be heated (as sea-freight be exposed to the sun, outdoor being exposed to the sun), the built-in acid of weld seam is activated, and produces hydrogen rapidly with metal reaction, hydrogen gather the generation high pressure, cause paint film to break, the acid etching thing is hydrolyzed into that yellow rust is clear to be gone out.It is a universal phenomenon that weld seam after the phosphatization returns that acid gets rusty.Usually the method for disposal that adopts has both at home and abroad:
A, high-pressure washing extrude it by force.The wash water of this method also must be done and could use after disacidify is handled again, so water loss is very big, also destroys the solidity to corrosion of phosphatize phosphate coat easily, and cost is higher.
Behind B, the bonderizing, use repeatedly airtight vacuum extracting, the built-in acid of weld seam is removed.Invest very greatly, cost is high.
C, improve weld horizontal, reduce and reduce to weld pore,, can not thoroughly eliminate weld seam after the phosphatization and return the acid phenomenon of getting rusty though be a way.
The phosphating process manufacturing cost that adopts is higher, influential to the electrophoresis ultra-filtration membrane.
Summary of the invention
In order to overcome all above-mentioned existing problems of using phosphatization liquid to bring in existing vehicle frame and the container electrophoretic painting pre-treatment process, the invention provides a kind of pretreatment process for electrophoresis coating, this technology not only can reduce cost, improve the quality, but also can solve the pollution problem of rich phosphorus.
For addressing the above problem, the present invention by the following technical solutions:
Pretreatment process for electrophoresis coating is characterized in that: this technology may further comprise the steps:
A, at first pending workpiece is put into carries out high-pressure washing in the high pressure water washing trough and know the workpiece surface dirt, during high-pressure washing, tank liquor temperature is 35-45 ℃, the washing time is 3 ' 20 " ± 15 ", free alkalinity is the 5-6 point, spray pressure is 0.35-0.4MP, if the suitable parameters in every is lower than the minimum parameter of above-mentioned parameter scope, will cause the dirt on the workpiece to handle thoroughly unclean, influence the treatment effect of subsequent technique, if be higher than the high-parameters of above-mentioned parameter scope, will increase production cost, reduce production efficiency.
B, the workpiece after will having washed are put into and are carried out degreasing in the degreasing tank, the workpiece surface greasy dirt is removed in removing, and during skimming treatment, tank liquor temperature is 50-60 ℃, degreasing time is 3 ' ± 12 "; free alkalinity is the 8-14 point, if the suitable parameters in every is lower than the minimum parameter of above-mentioned parameter scope, will cause the greasy dirt on the workpiece to handle thoroughly clean; influence the treatment effect of subsequent technique; if be higher than the high-parameters of above-mentioned parameter scope, will increase production cost, reduction production efficiency.
C, the workpiece with degreasing after intact are put in the Rinsing Area and are washed, the grease-removing agent of cleaning workpiece surface adhesion in skimming processes, avoid bringing grease-removing agent into pickling tank, time during washing is 1 ' ± 10 "; the time is too short, and it is thorough to cause degreasing fluid to clean, and the time is oversize; will waste the water source, increases production cost.
D, workpiece after having washed put into to go cleanup acid treatment in the pickling tank, remove the oxide skin and the rust of workpiece surface, during pickling, tank liquor temperature is 55-65 ℃, the pickling time is 2 ' 50 " ± 12 ", total acid point is the 550-650 point, if the suitable parameters in every is lower than the minimum parameter of above-mentioned parameter scope, it is thoroughly clean to cause oxide skin on the workpiece and rust to handle, and influences the treatment effect of subsequent technique, if be higher than the high-parameters of above-mentioned parameter scope, acid solution will form corrosion to workpiece body, reduce the structural strength of workpiece, increase production cost, reduce production efficiency.
E, the workpiece with pickling after intact are put in the Rinsing Area and are washed, and avoid bringing acid into thermokalite neutralizing treatment groove, pollute tank liquor, time during washing is 1 ' ± 10 ", the time is too short, and it is thorough to cause acid solution to clean; the time is oversize, will waste the water source, increases production cost.
F, the workpiece after will having washed is put into and in the lye vat workpiece surface is hidden acid and make neutralizing treatment then, and during the alkali lye neutralizing treatment, tank liquor temperature is 25-65 ℃, in and the time be 2 ' 50 " ± 13 ", in accelerating and speed, it is more thorough to neutralize, and uses 50 ℃ Na
2CO
3Solution is during as the alkali lye neutralizing treatment, treatment effect the best, if the suitable parameters in every is lower than the minimum parameter of above-mentioned parameter scope, will cause workpiece surface to hide sour neutralizing treatment totally not thoroughly, influence the treatment effect of subsequent technique, if be higher than the high-parameters of above-mentioned parameter scope, will increase production cost, reduce production efficiency.
G, the workpiece after the neutralizing treatment is put into contained poly-(quadrol-N then, N '-two (2-HPAA)) carrying out the workpiece surface rete in the 704A liquid handles, form the pre-treatment rete, improve the application bonding force, rete has the rust prevention during manufacture function simultaneously, time when the workpiece surface rete is handled is 2 ' 30 " ± 11 ", and described 704A liquid is the functional agent that Chengdu inferior first crystalline material company limited produces.
Poly-(quadrol-N in the above-mentioned technology, N '-two (2-HPAA)) be the major function agent of the serial isomer series product of EDDHA (EDDHA+EDDHMA+EDDHFA), it can form the unit molecule inner complex with the iron atom in iron and steel/cast iron, this unit molecule inner complex turns to exchange through intramolecular bond, be formed with the intermolecular inner complex of symmetric long chain type, form multilayer crystal chelating membrane in iron and steel/Cast Iron Surface.It is big that the intermolecular inner complex of this long chain type has a chelating constant, stable performance, good conductivity, advantage such as salt fog resistance, antiseptic power are strong.
The EDDHA structural representation:
The EDDHFA structural representation:
It is functional agent EDDHA, EDDHMA, EDDHFA that the 704A chemical conversion film forms mechanism, turns under the catalyst action at sufficient water and intramolecularly, in iron and steel/Cast Iron Surface following reaction takes place, and forms crystal film.Reaction process is as follows:
The 704A product can transform FeO, Fe2O3 oxide film film forming layer tissue, but speed is slow slightly, so the treatment time will prolong.Reaction process is as follows:
The combination principle of 704A product rete and coating: 704A product film rete mainly is the crosslinked action by the resin chain molecule in its surperficial vacant chela and the coating, forms the cross-linked layer of a resin and chela, reaches the reinforcement bonding force.
The vacant chela of 704A film surface has following variation characteristic:
1. the surperficial calcium magnesium crystallite settling influence that causes of bath water
Surface after the pre-treatment needs washing.As bath water hardness higher (heavier well water, rivers such as calcic, magnesium), dried film surface has the dim micro mist phenomenon of grayout.This is to cause owing to the vacant chela in calcium, magnesium etc. and surface in the water reacts the calcium magnesium crystallite settling of separating out.
A large amount of experiments and industry are used and shown: calcium magnesium crystallite settling is very little to the actual influence of bonding force, can not consider.
A large amount of detected results show: calcium magnesium crystallite settling detects drop remarkable influence.Reason is:
A. this class calcium magnesium crystallite settling, though stable to ortho-water, the slightly acidic of some dropping liquid can be dissolved its decomposition rapidly, makes the surface hydrophilic especially, the some dropping liquid very easily scatters.
B. the calcium magnesium crystallite settling after being dissolved by the decomposition of the slightly acidic of a dropping liquid under the chlorion mating reaction in a dropping liquid, has the accelerated corrosion effect to crystalline film, and vertical and horizontal diffusion corrosion is obviously accelerated, and causes the whole drop time on the low side.
C. the calcium magnesium crystallite settling of film surface, the back colour-change of being heated is bigger.But the pre-treatment performance to rete does not have influence substantially, and the common application user that color is had no special requirements need not worry.
2. shrink in the surperficial chela that pre-treatment after drying temperature too high (above 100 ℃) causes, the influence of bonding force.
Pre-treatment after drying temperature too high (when surpassing 100 ℃) can cause a large amount of vacant chelas to the crystal gap constrictions, thereby weaken the crosslinked action to the resin chain molecule during cooling, cause bonding force to reduce.
The present invention adopts above-mentioned technology, has following beneficial effect:
1, bonding force and salt fog are better than phosphatization.
2, use control simply, use water dilution back directly normal temperature, and interpolation detects simple.Need not heat, not need to add a large amount of auxiliary agents, table adjustment as phosphatization liquid.There are not precipitation, gas generation.Change the groove frequency and have only 1/10 of phosphatization liquid.
3, product neutrality does not have corrosion to facility environment.
4, can economize sketch form and transfer groove and multistep washing equipment and slag removal equipment, technology shortens, and investment diminishes, and water consumption reduces.
5, comprehensive cost has only (comprising auxiliary agent, table adjustment, heating power consumption, slagging-off, stoste expense) half of phosphatization.
6, because poly-(quadrol-N, N '-two (2-HPAA)) is neutral, have only the salinity of lower concentration in the solution, rete is a densest crystal, and mother liquor is not hidden in inside, is easy to clean.Therefore, multistep washing behind the conventional phosphatizing line, all can do a large amount of deleting, after electrophoretic painting is handled, can guarantee that two step ortho-waters embathe (crying rinsing again), one step pure water rinsing, therefore the just fine satisfied high-grade electrophoresis requirement of energy, uses poly-(quadrol-N, N '-two (2-HPAA)) behind the liquid product, can economize on water greatly.
7, because poly-(quadrol-N, N '-two (2-HPAA)) liquid product for neutral, nontoxic, human body do not had burn into do not fire not quick-fried, safety and environmental protection, no any gas, sediment produce in the production process, by the international environmental protection tests of SGS, meet ROHS of European Union and REACH instruction.
The invention will be further described below in conjunction with embodiment:
Embodiment
Embodiment 1, and pretreatment process for electrophoresis coating may further comprise the steps: at first pending workpiece is put into and carries out high-pressure washing in the high pressure water washing trough; During high-pressure washing, tank liquor temperature is 35 ℃, the washing time is 3 ' 05 "; free alkalinity is 5 points, and spray pressure is 0.35MP, the workpiece after having washed is put into carried out degreasing in the degreasing tank; during skimming treatment; tank liquor temperature is 50 ℃, degreasing time is 2 ' 48 ", free alkalinity is 8 points, workpiece with degreasing after intact is put in the Rinsing Area and is washed, time during washing is 50 ", the workpiece after having washed put into will go cleanup acid treatment in the pickling tank, during pickling; tank liquor temperature is 55 ℃; the pickling time is 2 ' 38 ", and the total acid point is 550 points, and the workpiece with pickling after intact is put in the Rinsing Area and washed, time during washing is 50 "; the workpiece after will having washed is then put in the lye vat and workpiece surface to be hidden acid is made neutralizing treatment, during the alkali lye neutralizing treatment, adopts 50 ℃ Na
2CO
3Solution, in and the time be 2 ' 37 ", then the workpiece after the neutralizing treatment is put into 704A liquid and carried out the workpiece surface rete and handle, the treatment time is 2 ' 19 ".
Be the contrast table of rete and phosphatize phosphate coat after this art breading below:
Be this technology and bonderizing cost and other parameter comparison sheet below:
Then the Resins, epoxy that adopts workpiece after this art breading to carry out different thickness being dusted, is that 120u, 100u, 80u and four kinds of workpiece of 60u carry out that bonding force detects and state of appearance analysis contrast to the thickness that dusts, its detected result such as following table:
This shows, adopt the workpiece rete after this art breading to compare with phosphorization membrane, its bending back bonding force and appearance effect are much improved,
Owing to do not contain inorganic phosphorus in the 704A liquid product, therefore in Coating Pretreatment, behind the use 704A liquid product, will no longer have the problem of inorganic phosphorus pollution and processing.Solve phosphorus well and polluted environmental issue.
Embodiment 2, and pretreatment process for electrophoresis coating may further comprise the steps: at first pending workpiece is put into and carries out high-pressure washing in the high pressure water washing trough; During high-pressure washing, tank liquor temperature is 40 ℃, the washing time is 3 ' 20 "; free alkalinity is 5.5 points, and spray pressure is 0.38MP, the workpiece after having washed is put into carried out degreasing in the degreasing tank; during skimming treatment; tank liquor temperature is 55 ℃, degreasing time is 3 ', free alkalinity is 11 points; the workpiece with degreasing after intact is put in the Rinsing Area and washed; and the time during washing is 1 ', the workpiece after having washed put into will go cleanup acid treatment in the pickling tank, during pickling, tank liquor temperature is 60 ℃, the pickling time is 2 ' 50 ", the total acid point is 600 points, and the workpiece with pickling after intact is put in the Rinsing Area and is washed; and the time during washing is 1 '; the workpiece after will wash is then put in the lye vat to workpiece surface Tibetan acid and is made neutralizing treatment, during the alkali lye neutralizing treatment, adopts 50 ℃ Na
2CO
3Solution, in and the time be 2 ' 50 ", then the workpiece after the neutralizing treatment is put into 704A liquid and carried out the workpiece surface rete and handle, the treatment time is 2 ' 30 ".
Be the contrast table of rete and phosphatize phosphate coat after this art breading below:
Be this technology and bonderizing cost and other parameter comparison sheet below:
| Treatment process | The pre-treatment of this technology of oil removing pickling | Phosphatization pre-treatment after the oil removing pickling | Estimate |
| Theoretical treatment surface-area m 2/ every kilogram | More than 200 | 15-20 | With the obvious advantage |
| Actual treatment surface-area m 2/ kilogram | More than 100 | 8-15 | |
| Raw materials cost unit/m 2 | 0.50 below | 0.35 more than |
| Treatment process | The pre-treatment of this technology of oil removing pickling | Phosphatization pre-treatment after the oil removing pickling | Estimate |
| Table is transferred raw materials cost unit/m 2 | 0 | 0.05 more than |
Then the Resins, epoxy that adopts workpiece after this art breading to carry out different thickness being dusted, is that 120u, 100u, 80u and four kinds of workpiece of 60u carry out that bonding force detects and state of appearance analysis contrast to the thickness that dusts, its detected result such as following table:
| Bending | Decortication | Skin | Tear stains | Tear stains | Trace | ||
| 60u | 90 degree bendings | 2 decortications | 1 embrittlement | Do not peel for 3 times | There are indivedual points to cover | There are a large amount of points to cover | Even no tear stains |
This shows, adopt the workpiece rete after this art breading to compare with phosphorization membrane, its bending back bonding force and appearance effect are much improved.
Embodiment 3, and pretreatment process for electrophoresis coating may further comprise the steps: at first pending workpiece is put into and carries out high-pressure washing in the high pressure water washing trough; During high-pressure washing, tank liquor temperature is 45 ℃, the washing time is 3 ' 35 "; free alkalinity is 6 points, and spray pressure is 0.4MP, the workpiece after having washed is put into carried out degreasing in the degreasing tank; during skimming treatment; tank liquor temperature is 60 ℃, degreasing time is 3 ' 12 ", free alkalinity is 14 points, workpiece with degreasing after intact is put in the Rinsing Area and is washed, time during washing is 1 ' 10 ", the workpiece after having washed put into will go cleanup acid treatment in the pickling tank, during pickling; tank liquor temperature is 65 ℃; the pickling time is 3 ' 2 ", and the total acid point is 650 points, and the workpiece with pickling after intact is put in the Rinsing Area and washed, time during washing is 1 ' 10 "; the workpiece after will having washed is then put in the lye vat and workpiece surface to be hidden acid is made neutralizing treatment, during the alkali lye neutralizing treatment, adopts 50 ℃ Na
2CO
3Solution, in and the time be 3 ' 3 ", then the workpiece after the neutralizing treatment is put into 704A liquid and carried out the workpiece surface rete and handle, the treatment time is 2 ' 41 ".
Be the contrast table of rete and phosphatize phosphate coat after this art breading below:
Be this technology and bonderizing cost and other parameter comparison sheet below:
Then the Resins, epoxy that adopts workpiece after this art breading to carry out different thickness being dusted, is that 120u, 100u, 80u and four kinds of workpiece of 60u carry out that bonding force detects and state of appearance analysis contrast to the thickness that dusts,
Its detected result such as following table:
This shows, adopt the workpiece rete after this art breading to compare with phosphorization membrane, its bending back bonding force and appearance effect are much improved.
Prove that by test of many times when workpiece carried out surface treatment, when various processing parameters were arranged within the process parameters range that this processing method provides, treatment effect was best.
Claims (3)
1. pretreatment process for electrophoresis coating, it is characterized in that: this technology may further comprise the steps:
A, at first pending workpiece is put into carries out high-pressure washing in the high pressure water washing trough; During high-pressure washing, tank liquor temperature is 35-45 ℃, and the washing time is 3 ' 20 " ± 15 ", and free alkalinity is the 5-6 point, and spray pressure is 0.35-0.4MP;
B, the workpiece after will having washed are put into and are carried out degreasing in the degreasing tank; During skimming treatment, tank liquor temperature is 50-60 ℃, and degreasing time is 3 ' ± 12 ", free alkalinity is the 8-14 point;
C, the workpiece with degreasing after intact are put in the Rinsing Area and are washed; Time during the degreasing after washing is 1 ' ± 10 ";
D, the workpiece after will having washed are put into and will be gone cleanup acid treatment in the pickling tank; During pickling, tank liquor temperature is 55-65 ℃, and the pickling time is 2 ' 50 " ± 12 ", and total acid point is the 550-650 point;
E, the workpiece with pickling after intact are put in the Rinsing Area and are washed; Carrying out the time of workpiece water when washing after the pickling is 1 ' ± 10 ";
F, the workpiece after will having washed is put into and is carried out the alkali lye neutralizing treatment in the lye vat then; During the alkali lye neutralizing treatment, tank liquor temperature is 25-65 ℃, in and the time be 2 ' 50 " ± 13 ";
G, the workpiece after the neutralizing treatment is put into carried out the workpiece surface rete in the 704A liquid that contains poly-(quadrol-N, N '-two (2-HPAA)) and handle then, the time when the workpiece surface rete is handled is 2 ' 30 " ± 11 ".
2. pretreatment process for electrophoresis coating according to claim 1 is characterized in that: described neutralization alkali lye is 50 ℃ Na
2CO
3Solution.
3. pretreatment process for electrophoresis coating according to claim 1 is characterized in that: described 704A liquid is commercially available surface treatment functional agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100165920A CN101333674B (en) | 2008-06-13 | 2008-06-13 | Pretreatment process for electrophoresis coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100165920A CN101333674B (en) | 2008-06-13 | 2008-06-13 | Pretreatment process for electrophoresis coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101333674A CN101333674A (en) | 2008-12-31 |
| CN101333674B true CN101333674B (en) | 2010-09-15 |
Family
ID=40196550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100165920A Expired - Fee Related CN101333674B (en) | 2008-06-13 | 2008-06-13 | Pretreatment process for electrophoresis coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101333674B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191508A (en) * | 2010-03-12 | 2011-09-21 | 上海西重所重型机械成套有限公司 | Surface cleaning method for low-plasticity metal plates and strips |
| CN102114460A (en) * | 2011-03-24 | 2011-07-06 | 常州市骠马涂装系统工程有限公司 | Pretreatment process for coating |
| CN102644085A (en) * | 2012-05-04 | 2012-08-22 | 奇瑞汽车股份有限公司 | Cleaning method for car body after phosphorization |
| CN102719873A (en) * | 2012-07-12 | 2012-10-10 | 昆山耀邦金属工业有限公司 | Cathode electrophoretic coating complete covering method for microchannel heat exchanger |
| CN104694996A (en) * | 2015-02-13 | 2015-06-10 | 柳州五菱汽车有限责任公司 | Electrophoresis pretreatment process for vehicle parts |
| CN105369326A (en) * | 2015-09-28 | 2016-03-02 | 合肥常菱汽车零部件有限公司 | Surface treatment process before automobile part cathode electrophoretic coating |
| CN105256316A (en) * | 2015-10-14 | 2016-01-20 | 哈尔滨飞机工业集团有限责任公司 | Phosphorization pretreatment method for alloy steel parts |
| CN109609898A (en) * | 2018-12-27 | 2019-04-12 | 保定市胜新金属表面处理有限公司 | A kind of anacidity pre-treating technology on energy-saving and environment-friendly metal zincizing surface |
-
2008
- 2008-06-13 CN CN2008100165920A patent/CN101333674B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101333674A (en) | 2008-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101333674B (en) | Pretreatment process for electrophoresis coating | |
| CN100516311C (en) | Method for removing releasing agent and greasy dirt of aluminum alloy forging piece | |
| CN1035442C (en) | Cleaning agent for cold-rolled silicon steel plate | |
| CN108707888A (en) | A kind of aluminum alloy surface passivation process improving corrosion resistance | |
| CN103757647A (en) | Steel material acid-washing and phosphorization method | |
| CN107118854A (en) | Acid paraffin removal water composition | |
| CN102220592B (en) | Foamless floating-oil-type alkaline cleaning agent used for pre-treatment of pre-coated steel plate | |
| CN107130236A (en) | A kind of aluminum alloy surface passivation process for improving corrosion resistance | |
| CN107059084A (en) | The method for preventing roll from plating pollution of chromium environment | |
| CN102965680A (en) | Phosphorus-free oil removing process | |
| CN109811334A (en) | A kind of environment-friendly type metal surface treatment process | |
| CN101063200A (en) | Normal temperature phosphating liquor | |
| CN112481622A (en) | Water-based cleaning agent for hot forging die | |
| CN110257838B (en) | Aluminum profile powder spraying pretreatment process | |
| CN108914136B (en) | Steel pipe galvanizing pretreatment process | |
| JP3791182B2 (en) | Electrogalvanization of secondary molded products | |
| CN101215715A (en) | Magnesium alloy pickling activate fluids | |
| CN102618876B (en) | Method for removing rolling oil from double surfaces of rolled copper foil | |
| CN203901736U (en) | Aluminum-plastic composite membrane treatment device with resistance to hydrofluoric acid corrosion | |
| CN101423924A (en) | Degreasing, oil removing and sulfuric acid refining one-step method hot-dip galvanizing pre-treatment process | |
| CN109594081A (en) | A method of metal works are cleaned using recirculated water | |
| CN103572303B (en) | A kind of steel chemical pre-processing method and pickle solution used | |
| CN108179445A (en) | A kind of no acid electrolyte and its application process | |
| CN103849869A (en) | Surface treatment solution for bicycle common carbon steel and preparation method of surface treatment solution | |
| CN116159723B (en) | Metal coating process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20130613 |